The action of a white blood cell engulfing a bacterium is known as ____
a. pinocytosis only
b. phagocytosis only
c. exocytosis and phagocytosis
d. endocytosis and pinocytosis
e. phagocytosis and endocytosis
ANSWER: e
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How many carbon dioxide molecules does it
take to synthesize one molecule of glucose?
a. 2 b. 4 c. 6 d. 12 e. 18
Down syndrome in humans is due to
A. two Y chromosomes. B. trisomy (three copies of chromosome 21). C. three X chromosomes. D. monosomy (one copy of chromosome 21).
Which of the following statements concerning phytochrome-induced responses is FALSE?
a. All responses are very rapid and short-term. b. Red light causes potassium channels to open. c. The absorption of light by one part of the phytochrome molecule triggers a conformational change in another part. d. Phytochrome activates transcription of the gene for a subunit of rubisco. e. Far-red light causes potassium channels to close.
Introns
A) are removed by a complex called the spliceosome. B) are sometimes left in the mRNA sequence for alternative splicing. C) are only found in eukaryotes. D) are considered to simply be junk DNA. E) are removed from mRNA in the cytoplasm.